Improvement in sewer and other traps



W. F. DOWNEY. Sewer and other Traps. No. 197,838.

Patented Dec. 4, 1877.

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N-PETERS, PHOTO-LITHOEAPHER) WASHINGTON. D C.

UNITED 'Srnrns PATENT OFFICE.

WILLIAM F. DOWNEY, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN SEWER AND OTHER TRAP S.

Specification forming part of Letters Patent No. 197,838, dated December 4, 1877; application filed August 27, 1877.

To all whom it may concern:

Be it known that I, WILLIAM F. DoWNEY, of the city and county of Washington, and District of Columbia, have invented certain new and useful Improvements in Sewer and other Traps, of which the following is a specification:

This invention relates to im provements made on the sewer-traps patented by me on the 13th day of February, 187 7 and consists in the use, with or without the ball-valve shown in said patent, of a sectional globe-valve, hung across the induction-pipe in such manner as to stand normally closed, and yet to yield to slight pressure from behind, so that it will open to permit the escape of the outflow, and immediately close after its passage, to act as a stench-trap; also, in adding to the trap a pipe, intended -to be connected with the rain-water pipe, for the escape of noxious vapors and relieving the flap-valve from their pressure.

In the annexed drawings, making part of this specification, Figure Iis a longitudinal section. Fig. II is a transverse section.

The same letters are employed in both figures in the designation of identical parts.

A is the body of the trap, A the cover, and B the ways upon which the ball-valve operates. O is the induction-pipe, and D the dischargepipe, as in said former patent set forth.

Instead of inclining the ways to leave the ball at the outlet end, Iincline them so as to have the ball standin position normally to close the induction. I have added a valve, E, which is a flap-valve, convex where it bears on the valveseat at the mouth of the inductionpipe, and

which I prefer to make of metal, with a facing of india-rubber. This valve is suspended at E in such a manner as to hang normally against its seat, but with little pressure, being nearly balanced, so as to yield. to pressure coming from behind. It will thus, While closed,

serve as astench-trap, preventing the inflow of noxious vapors generated in the sewer, and

yet yielding readily to pressure from the other direction.

As the pressure of sewer-gas would tend to hold the valve closed, and so interfere with the outflow, it is desirable to prevent this, which I do by connecting a branch, F, opening out of the chamber A, with the rain-Water pipes of the building, so that thegases may be drawn off, thus obviating any back press- 1. In combination with the chamber A and the horizontal induction-pipe O, entering above the bottom of the chamber along which the sewage-water flows through the outletpipe D,

the swinging valye E, hung so as to normally close the induction-pipe against the entrance of backwater or sewer-gas, but at the same time to yield to light pressure in the direction of the outflow, substantially as set forth.

. 2. In combination with the chamber A, pipe 0, and valve E, hung substantially as described, the pipe F, for relieving the valve from back pressure, substantially as set forth.

In testimonywhereof I have signed my name to this specification in the presence of two subscribing witnesses.

WM. F. DOWNEY.

Witnesses:

R. P. CAFFERTY, J. T. WALLAQE. 

